Engine starting device



C- 1932. w. s. CEABLOM ENGINE STARTING DEVICE Filed April 1, 1951 16 if 26'5-1-1 f1? 2.

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ATTORNEYS Patented Dec. 20; 1932 UNITED STATES. ATENT O C WENDELL scEABLOM, or DETROIT, MICHIGAN, AssIGNoRor oNE-HALr TO CAMILLE ROY, EnMoNnJ. nor AND ."rosnrn ABENTIROD, ALL or nnrnorr, MICHIGAN ENGINE STARTING DEVICE Application and April 1,

- a This invention relates to an electric startergenerator for internal combustion engines,

and'an object is to provide a' construction which is, such as to make the same especially adaptable for attachment to the crank case of an engine, conserving space, presentmg I avery neat appearance, and providing a comever the motor is operated at a higher speed than that of the generator, said connecting means being compact and efficient in opera tion and not liabletoget out of order.

With the above and other ends in view, the

invention consists in the matters hereinafter means for transmitting to generator; a

set forth and moreparticularly pointed out inthe appended claims, reference being had to the accompanying drawing in which Fig. 1 is a side elevation of a starter-generator illustrative of the invention and illustrating the application thereof to an internal combustion engine;

A 2 is an enlarged longitudinal section throughadjacent end portions of generator and motor casings and interposed connecting motion from motor Fig. 3is a transverse section substantially upon the line 33 of Fig. 2; I Fig. 4 is a longitudinal, sectional detail showing a'modified construction of .clutch device; and

Fig. 5 is a side elevation with parts broken it away and in section, of a slightly modified construction of starter-generator, drawn to, .a reduced scale.

As shown in thedrawing, A indicates an internal combustion engine of the usual ver- I ticalicylinder type and construction, the same being'provided with the usual pulley casing .A' on the forward end of its crank case A andenclosing a pulley lon the forward end 1931. Serial no; 526,984.

of its crankshaft 2 and a driving belt 3-engaging said pulley.

Firmly secured to a flange 4 a laterally extending portion 5 of said casing A, b bolts 6, is the casing 7 of a generator 8 in icated in dotted lines in Fig. 1. This generator is mounted upon .an axial shaft '9 which is mounted in bearings in the ends of said casing 7 and upon this shaft is secured the armature 10 (shown in Fig. 2) of said generator. The forward end of this shaft 9 is extended into the offset, portion. 5 of the casing A where it is provided with a pulley 11 over which the belt 3 runs to transmit motion to or from the en ine crank shaft 2, to or from said generator shaft 9. 7: The generator casing 7 is thus supported at its forward end only by the flange 4 of the offset portion ofthe casing A and extends parallel with one side of the motor rearwardly from said casing and the op osite or rear end of said casing 7 is flanged outwardly for the securing thereto by bolts 12, of a second orintermediate clutch casing 13 into which the rear end of theshaft 9extends and has rigidly secured thereto, an internal gear 14 of large diameter. I A motor oasing15 is secured at one end to the opposite end of the casing 13, by bolts 16 and in this motor casing is an electric motor 17 havinga shaft 18 mounted in bearings in the ends of saidcasing with said motor shaftin longitudinal axial alignment with the generator shaft 9, but not directly connected thereto.

. Keyed to. said motor shaft 18 within the casing13, is the inner or cam member 19 of an over-running clutch, the, outer or sleeve member 20 of which is free to turn upon said shaft and is formed with a cylindrical or sleeve portion overlying a series of eccentric surfaces 21 formed upon the exterior of the inner or hub member 19 of the clutch, said surfaces being formed between longitudinal ribs 22 on said member, thus forming between said ribs, longitudinal recesses in the exterior of said member, the bottom surfaces 21 of which recesses are formed eccentric to the axis of rotation of said hubor cam member .with said surfaces approaching said axis at their forward sides in the direction of normal rotation of said member. These recesses between the ribs are therefore deeper at their forward than at their rear sides so that a series of rollers 23 in each recess will, when urged toward the shallow side of the recess by the forward turning of said cam member, be caught between the sleeve and cam surface of the bottom of each recess and transmit motion from said hub or cam member through said rollers to said sleeve 20, which sleeve is formed with external gear teeth 944i in mesh with the teeth of an idler gear 25 mounted to rotate freely upon a stud 26 carried by the end wall of the motor casing 15, and which idler is in constant mesh with the internal gear teeth of the large gear 14 keyed to the generator shaft 9.

Therefore, with his arrangement, when the cam or hub member 19 on the motor shaft 18, is rotated by said motor at a higher rate of speed than that at which generator shaft 9 is turning, power will be transmitted from the motor 17 by the overrunning clutch, to the internal ear 14 and generator shaft 9 and through the driving belt 3 to the engine crank shaft to turn the engine over in starting. When the engine has started, it will drive 'the generator through the belt 3 and when the speed of the generator so driven, exceeds the speed of the motor, the sleeve member 20 of the clutch will roll the rollers Zr-Shack into the deep sides of the recesses in the member 19 and out of frictional engagement with said sleeve, permittin the motor 17 to turn freely, independently 0 said generator or to stand still while the motor A is running and drivin the generator.

7 I3y securing the generator and electric motor together in endwise alignment and connecting them at their adjacent ends by a casing containing the over-running clutch, a very compact arrangement is secured and an arrangement which 15 particularly adaptable for application to an internal combustion engine of the usual construction, the forward end of the generator casing being bolted to the usual casing at'the forward end of the engine crank case, by entending this casing laterally to form a chamber for the pulley 11 and also a support for said generator which extends rearwardly alongside the engine and carries the clutch casing and electric motor casing connected endwise thereto.

A modified construction of overrunning clutch is shown in Fig. 1, the hub or cam member 19 being keyed directly to the shaft 18 as before and formed with the external cam surfaces 21 for the rollers 23. The sleeve 20, however, instead of rotating upon the shaft 18, is sleeved over and carried by the member 19, there being interposed between said sleeve and said cam member, two annular ball bearings 28, one at each end of said sleeve member, so that said sleeve member will turn freely and be guided upon said cam member,

the cam surfaces of which cam member function the same as before to release the rollers when said cam member lags behind the s d of the sleeve member, and to cause said ro lers to wedge in between said cam member and sleeve when said cam member is rotated at a speed reater than that of the sleeve.

As illustrated in Fig. 5 of the drawing, the idler gear 25 may be dispensed with if so desired, by offsetting the motor casing 15 relative to the clutch casing 13 so that the sleeve member 20 having the external gear teeth 21, will engage directly with the internal gear 14. Also instead of employing pulleys and belt to form a driving connection between engine crank shaft and generator shaft, a gear 27 may be provided on the end of said generator shaft to mesh with a lar a gear, (not shown) substituted on the cran shaft for the pulley 1.

Obviously other changes may be made in the construction and arrangement of parts, without departing from the spirit of the invention, and I do not therefore wish to limit myself to the particular construction and arran ement shown.

IIaving thus fully described my invention, what I claim is 1. In an electric starter-generator for an internal combustion engine a casing at the forward end of said en inc and havin an offset portion extending literally bcyon the side of said engine, gearing in said casing for transmittingpower to and from the crank shaft of said engine, a generator casing secured at one end to said offset portion of said casing on said engine to extend rearwardly therefrom alongside the engine, a. generator in said generator casing having a shaft to extend into said ofi'set portion of said casing on said engine for operative connection with said gearing, a motor casing, an electric motor in said motor casing having a. shaft extending from said casing, a clutch casing interposed between the adjacent ends of said motor and generator casings for rigidl conmeeting the same and of a diameter submtially equal to the diameter of said casings, and overrunning clutch mechanism in said clutch casing for transmitting motion between said motor shaft and said generator shaft.

2. In an electric starter-generator, the combination of a generator casing, 21 enerator in said generator casing having a aft projecting from said casing at its ends, an overrunning clutch casing secured at one end to an end of said generator casin in axialalignment therewith, with an end 0 said generator shaft extending into said clutch casing at the axis thereof, a motor casing secured at one end to said clutch casin at the side thereof opposite that at which it is secured to said generator casing, a motor insaid motor casing having a shaft extending into said clutch casing, an internal gear on said generator shaft in said clutch casing and of a diameter I gear on said motor shaft.

and width substantially equal to the internal diameter and length of said clutch casing, a small gear on the end of said motor shaft v within said internal gear at the axis thereof,

an idler gear for transmitting motion between said internal gear and small gear on said motor shaft, all within said internal gear, and one way driving'clutch mechanism in said.

3. In an electric starter-generator, the combination of a generator casing, a generator in said generator casing and having a shaft, with one end projecting from the end of said generator casing, a clutch casing secured to the. opposite end of said generator casing and supported thereby, a motor casing secured to the side of said clutch casing opposite that atwhich said clutch casing issecured to said generator casing and supported wholly by said clutch casing, a motor in said motor casing having a shaft mounted in bearings in the ends of said motor casing with one end of said shaft extending into said clutch casing, a largeinternal gear on the end of said generator shaft within said clutch casing, as small gear on the end of said motor shaft within said clutch casing to turn freely thereon, a cam member on said motor shaft and having cam surfaces opposing the inner sur-,

face of said small gear, and rollers between said cam surfaces and inner surface of said gear to wedge therebetween when said motor shaft is rotated faster than said generator shaft.

In testimony whereof I aflix my signature.

WENDELL S. CEABLOM. 

